Another thought has come up a few times. "Know the system". Just before I retired from flying in the airlines, and for a short time after, I took a course to receive a Certificate in Patient Advocacy. Thought I might retire into that field, but for various reasons, have not gone any further pursuing that field. One of the things I learned from that course, and from my own personal experience, is that the best medical care we can receive, also comes from our own active participation in it. In other words, you can be your own best advocate. However, when crap really hits the fan, your spouse, or another family member, or entrusted friend can become your own best advocate. Take the time to understand your billing statements and what your doctors are telling you. If you disagree with something on your bill, don't just ignore it as something insurance will pay, but question it and have it corrected if wrong! If you question something your doctor says or tests they give, ask! Respect their experience and education, but also trust your body and feelings! Make use of the many organizations available in various medical fields. (Ie, American Cancer Society, etc.) Then there are the "professional patient advocates" or ombudsmen that can help one navigate the system as well. Sure all this stuff takes some time. But I personally feel in the end it is worth it. After all, it is YOUR health.
And with that same attitude, my next quest is to learn more about Medicare and the VA in the next several years. While I'm not retired from the military, I did spend some time in the USCG before deciding to get out and fly commercially, taking a Honorable Discharge.